Question

question 9 1.75 pts which characteristic of a phospholipid contributes to the fluidity of the membrane? the head a saturated fatty acid tail double bonds in the fatty acid tail cholesterol content question 10 1.75 pts red blood cells placed in distilled water will ____________. shrink as proteins move out of the cell by diffusion swell as water moves into the cells by active transport shrink as sodium moves out of the cells by diffusion remain unchanged because of homeostatic mechanisms swell as water moves into the cells by osmosis question 11 1.75 pts phagocytic white blood cells engulf and digest bacteria and cellular debris. which organelle would be most involved in the digestion of the engulfed material? ribosomes lysosomes endoplasmic reticulum golgi apparatus mitochondria

Explanation:

• Question 9: Double - bonds in fatty acid tails introduce kinks, preventing phospholipids from packing tightly and increasing membrane fluidity. The head is involved in polarity and interactions, saturated tails decrease fluidity, and cholesterol has a more complex role in modulating fluidity rather than being the main contributor here.
• Question 10: Distilled water is hypotonic compared to the inside of red blood cells. Water moves into cells by osmosis (a passive process), causing them to swell. Proteins don't move out by simple diffusion easily, sodium movement isn't the main factor here, and red blood cells don't have complex homeostatic mechanisms to prevent swelling in this case.
• Question 11: Lysosomes contain digestive enzymes that break down engulfed materials like bacteria and cellular debris. Ribosomes are for protein synthesis, endoplasmic reticulum is involved in protein and lipid synthesis and transport, Golgi apparatus modifies and packages proteins and lipids, and mitochondria are for energy production.

Answer:

• Question 9: Double bonds in the fatty acid tail
• Question 10: swell as water moves into the cells by osmosis
• Question 11: Lysosomes